Heat and Fire Weather Concerns West; Heavy Rain and Thunderstorms from Plains to mid-Atlantic

Thunderstorms and locally heavy rainfall is expected from the Central Plains to the Ohio Valley, mid-Atlantic and across the Southeast. Severe weather from the Upper Midwest to Central Plains increases on Friday. Major to Extreme HeatRisk continues across the Southern Plains to the lower Mississippi Valley late this week. Fire weather concerns for the northern Rockies and northern Plains today. Read More >

Current conditions at

Allentown, Lehigh Valley International Airport (KABE)

Lat: 40.65°NLon: 75.45°WElev: 384ft.

Fair

84°F

29°C

Humidity 49%
Wind Speed W 12 G 18 mph
Barometer 29.87 in (1011.1 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 10 Sep 3:51 pm EDT
Extended Forecast for

2 Miles ENE Mertztown PA

  • Tonight

    Tonight: A slight chance of showers after 1am.  Mostly cloudy, with a low around 63. West wind around 5 mph becoming calm  in the evening.  Chance of precipitation is 20%.

    Low: 63 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Friday

    Friday: Mostly cloudy through mid morning, then gradual clearing, with a high near 78. North wind around 5 mph.

    High: 78 °F

    Becoming
    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 56. Northwest wind around 5 mph becoming calm.

    Low: 56 °F

    Mostly Clear

  • Saturday

    Saturday: A chance of showers after 2pm.  Partly sunny, with a high near 78. East wind around 5 mph becoming south in the afternoon.  Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    High: 78 °F

    Mostly Sunny
    then Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 8pm.  Low around 65. South wind around 5 mph becoming calm  after midnight.  Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.

    Low: 65 °F

    Showers

  • Sunday

    Sunday: Showers, mainly before 8am.  High near 81. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 81 °F

    Showers then
    Chance
    Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 64.

    Low: 64 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 61.

    Low: 61 °F

    Partly Cloudy

Detailed Forecast

Tonight
A slight chance of showers after 1am. Mostly cloudy, with a low around 63. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Friday
Mostly cloudy through mid morning, then gradual clearing, with a high near 78. North wind around 5 mph.
Friday Night
Mostly clear, with a low around 56. Northwest wind around 5 mph becoming calm.
Saturday
A chance of showers after 2pm. Partly sunny, with a high near 78. East wind around 5 mph becoming south in the afternoon. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Saturday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 8pm. Low around 65. South wind around 5 mph becoming calm after midnight. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.
Sunday
Showers, mainly before 8am. High near 81. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
Partly cloudy, with a low around 64.
Monday
Mostly sunny, with a high near 79.
Monday Night
Partly cloudy, with a low around 61.
Tuesday
Mostly sunny, with a high near 82.
Tuesday Night
Partly cloudy, with a low around 66.
Wednesday
A chance of showers. Mostly sunny, with a high near 83. Chance of precipitation is 30%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 62. Chance of precipitation is 30%.
Thursday
A chance of showers. Partly sunny, with a high near 78. Chance of precipitation is 50%.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ENE Mertztown PA
 40.5°N 75.63°W (Elev. 650 ft)
4:09 am EDT Sep 10, 2026
4pm EDT Sep 10, 2026-6pm EDT Sep 17, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database